Is waiting a long time for urine drops to stop considered an act of worship for which a Muslim is rewarded?

It is permissible to receive a reward for lawful means that are used to achieve obedience, even if they are not acts of worship in themselves, such as walking to prayer. Therefore, if waiting in an open space is necessary to complete purification (istibra') from urine, and this is a religious obligation, then there is a reward for it. However, if it is due to obsessive whispering (waswasa), then the reward lies in striving against it.